Maintaining Session in Silverlight

This can be very useful when you create a business application or a simple application wherein you need a login form. As you all know, Silverlight does not support session, but this can be implemented with the?help of aspx page, which supports session.
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How do we implement this;
Simple. Use WCF service; I dont think there is a better option than this.
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example:
I am creating a Service class, which has two methods GetSessionValues and SetSessionValues; Since I am using .Net framework 4.0, I can?utilize the?Dictionary class to send / receive a set of data to / from the server.
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Here are the methods used
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[OperationContract]
        public bool SetSessionValues(Dictionary sessionValues)
        {
            bool isSuccess = false;
            try
            {
                foreach (var item in sessionValues)
                {
                    System.Web.HttpContext.Current.Session[item.Key] = item.Value;
                }

                isSuccess = true;
            }
            catch (Exception ex)
            {
                isSuccess = false;
                AppWebHelper.LogError(ex, "SetSessionValues", "SessionManagerService");
            }

            return isSuccess;
        }

        [OperationContract]
        public Dictionary GetSessionValues(List sessionKeys)
        {
            Dictionary sessionValues = new Dictionary();

            try
            {
                foreach (string key in sessionKeys)
                {
                    if (System.Web.HttpContext.Current.Session[key] != null)
                    {
                        sessionValues.Add(key, Convert.ToString(System.Web.HttpContext.Current.Session[key]));
                    }
                }
            }
            catch (Exception ex)
            {
                AppWebHelper.LogError(ex, "GetSessionValues", "SessionManagerService");
            }

            return sessionValues;
        }